Hint 1

The two conditions we've outlined mean that we'll need two probabilities. These are: the probability of having at least one child is Select an answer P(X > 1) P(X >= 1) P(X <1) P(X <=1) which is found by calculating Select an answer 1-P(X>1) 1-P(X>=1) 1-P(X=0) 1-P(X<=1)